Square.



Patented April 11, 1905.

PATENT OFFICE.

ROBERT C. LYNN, OF YAZOO CITY, MISSISSIPPI.

SQUARE.

SPECIFICATION forming part of Letters Patent No. 786,824, dated April11, 1905.

Application filed Decemher22, 1904. Serial No. 237,913.

To (ZZZ whom it may concern:

Be it known that I, ROBERT C. LYNN, acitizen of the United States ofAmerica, and a resident of Yazoo city, county of Yazoo, State ofMississippi, have invented certain new and useful Improvements inSquares, of which the following is a full and clear specification,reference being had to the accompanying drawings, in which Figure 1 is aperspective view, Fig. 2 a longitudinal section, and Fig. 3 a transversesection, of my device.

The object of this'invention is to provide a useful tool for machinists,millwrights, and other engineers and mechanics, and while it has avariety of uses it is especially adapted for placing two or more linesof shafting ex: actly parallel and level with each other, as more fullyhereinafter set forth.

To the accomplishment of this object and such others as may hereinafterappear the invention consists of the parts and combination ofparts-hereinafter fully described, and particularly pointed out in theappended'claims, reference being had to the accompanying drawings,forming a part of this specification, in which the same referencecharacters designate like parts throughout the several views.

Referring to the drawings by letters, a designates a comparatively longstraight-edge, which may or may not be provided on its upper face withmarks indicating a linear measure. Running the full length of the underside of this bar is a groove f. This straightedge slidably fits a grooveor recess formed in the front side of the head 0, forming an integralpart of the forward end of a bar 5.

In the upper side of the bar I) is inserted a spirit-level d, and in theunder side" of this bar is formed a central longitudinal groove 0, Vshape in cross-section. The straight-edge is clamped in its adjustedposition in the slot by means of a bolt g extending inward from the rearside of head a and lying under the straight-edge, its'forward endprovided with an upward-extending lug or hook it, which engages ingroove f. A thumb-nut 2', bearing on the rear wall of the head, isprovided for drawing'the hook it against the adjacent wall of the groovef to clamp the straightedge in place. g

It will be observed that when the straightedge is clamped in the grooveits rear edge .will bear solidly against the rear wall of the groove,and as this wall is exactly at right angles to the longitudinal centerof the V- shaped groove in the bottom of the bar the straight-edge willbe held at exactly right angles to said groove. By loosening the nut 11the straight-edge may be adjusted back and forth or may be removedentirely from the head.

It will be observed that when the bar Z) is placed upon the shaft theV-groove insures the bar lying exactly parallel with the axial line ofthe shafting, and the spirit-level indicates whether the shafting isexactly horizontal. It will be seen, therefore, that by simply adjustingthe straight-edge to the desired point and looking it it will be asimple matter to line up parallel shafting.

Other uses of the device will readily suggest themselves to a machinist.I

It will be apparent to those skilled in the art that Various mechanicalembodiments of the invention are possible, and therefore I do not wishto belimited to the exact arrangement and construction shown.

What I claim, and desire to secure by Letters Patent, is.

1. In combination, a bar having a longitudinal V-groove in its underside and a longitudinally-extending spirit-level in its upper side and atransverse groove in its forward end, a straight-edge slidably mountedin said groove and lying at exactly right angles to the groove in theunder side of the bar and projecting outwardly in opposite directionsfrom said head, and means for clamping said straight-edge in itsadjusted positions.

2. In combination, a bar having a longitudinalV-groove in its under sideand a transverse groove in its forward end, a straightedge slidablymounted in said groove and lying at exactly right angles to the groovein the under side of the bar and projecting outwardly in oppositedirections from said head, and means for clampingsaid straight-edge inits adjusted positions.

3. In a tool of the class described, the combination of a bar having alongitudinal groove in its under side and an upward-extending headportion at its forward end, this head portion being grooved transverselyin its front side, the rear wall or edge of this groove lying at rightangles to the groove in the under side of the bar, a straight-edgeworking in said groove, and a clamp device consisting of a screwextending into the head from the rear side and provided with a hookengaging the straight-edge and a tightening thumb-nut 5 bearing againstthe rear face of said head.

In testimony whereof I hereunto affix my signature, in the presence oftwo witnesses, this 15th day of December, 1904.

ROBERT C. LYNN.

Witnesses:

W. D. LAWSON, MAURICE WILsoN.

